To get that look you have to choose the right subject distance and then to get the subject's face to fill the frame you need to choose a focal length to get that. If you are using an APS-C camera you will want to choose a 33mm lens. If you are using a full frame 35mm camera you will want a 50mm lens.
The most popular large camera sensor sizes are Full-frame, APS-C, and Micro Four Thirds. Whereas smaller cameras, super-zooms, and smartphones tend to use much smaller sensor sizes of 1″, 1/1.7″, and 1/2.3″. Popular Large Camera Sensors. Full-Frame is the largest of the three most popular large camera sensors. The implication is that if a full-frame lens is used on a camera with an APS-C sized sensor, only the middle portion of the image circle is used and the image will appear as if it has been made by a lens with a focal length that is 1.5x longer than the actual marked length. If an APS-C format lens is used on a full-frame camera it is incapable Select the Sony APS-C crop factor with a value of 1.53x from the list of sensor sizes. Now the calculator is an APS-C focal length calculator. Go to the second section, "35mm full-frame equivalents", and input a focal length of 50 mm and an f-stop of 4.
The same reasoning applies to full frame or APS-C digital sensors. While the former is 24 x 36 mm in size, the latter is 16.7 x 25.1 mm. The lenses designed for full frame have more image circle than what is needed for an APS-C digital sensor, while the reciprocal does not apply. A full frame lens will work in APS-C but not the contrary.
The depth of field and bokeh (background blur) will be approximately the same on a full frame camera with f2.8 and on an aps-c with f1.8 (on the same focal length - for examples aps-c=50mm, FF=75mm), but with the same settings (ISO+shutter speed), the aps-c+f1.8 will be slightly brighter than the FF+f2.8. Hope its kinda understandable :D. For
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10. Nikon 1.5X APS-C sensors in their current lineup are actually 1.52-1.53X depending on the exact measurements of the various different sensors in different models. Some older, discontinued models in the D3x00 series are slightly smaller at 1.55-1.56X. The difference between 1.52X and 1.53X is 0.65789 percent.

Fokal lensa ekuivalen. Pokoknya yang punya kamera APS-C (Nikon, Sony, Pentax, Fuji, Samsung) ingatlah, apapun lensa yang dipasang, akibat crop factor ini maka fokal lensa ekuivalennya adalah fokal lensa tertulis dikali 1,5 (khusus Canon APS-C kali 1,6). Khusus Olympus dan Panasonic kali 2. Dasar Fotografi dan Lighting. This is why 35mm at F2 on an APS-C sensor will produce a wider (more in focus) depth of field in comparison to a 50mm at F2 on a full frame sensor, even if the focal length appears the same. Because technically, it's like you’re shooting a full frame 35mm F2 lens on the APS-C camera, just cropping it 1.5x due to the APS-C sensor being U4S7I.
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  • full frame vs aps c focal length